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Francisco Javier Bonilla

Francisco Javier Bonilla
CIC Energigune, Vitoria-Gasteiz

PhD

About

23
Publications
2,149
Reads
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362
Citations
Citations since 2017
12 Research Items
292 Citations
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Additional affiliations
May 2016 - present
CIC Energigune, Vitoria-Gasteiz, Spain
Position
  • PostDoc Position
February 2014 - October 2015
Institut National des Sciences Appliquées de Toulouse
Position
  • PostDoc Position
February 2010 - September 2013
Sorbonne Université
Position
  • PhD Student

Publications

Publications (23)
Article
Regarding the cost and safety concerns arising together with the increasing demands on Lithium-ion batteries (LIBs), high energy density Ni-rich LiNi0.8Co0.1Mn0.1O2 (NMC811) materials are of substantial interest as cathode materials for the next-generation commercial LIBs. However, their low cycling stability hinders their use in large-scale applic...
Article
Graphite ineffectiveness in sodium storage has induced extensive research on non-graphitic carbons as high-performance active materials for negative electrodes of Na-ion batteries. Among these, soft carbons are promising for high-power sodium storage, yet their practical success is jeopardized by their low initial coulombic efficiency (i.e. 65-70%)...
Article
Full-text available
Highly oriented thin‐film electrodes are the best playground to better understand the evolution of the electrode‐electrolyte interfaces during battery operation. This is crucial to develop next generation batteries. In this cover the authors represent Li ions (spheres) from the electrolyte (fog) reaching LTO electrode surface (SEM image) as in cell...
Article
Full-text available
Among the electrodes for Li‐ion batteries, Li4Ti5O12 (LTO) stands out as anode owing to its stability and safety, in part ascribed to its low surface reactivity. However, the overlayer formation on the LTO surface upon electrochemical cycling is reported in recent years; a rough surface layer of electrochemically inactive α‐Li2TiO3 on top of the LT...
Article
Solid polymer electrolytes (SPEs) with new functionalized ethyl cellulose bearing a lithium/sodium fluorosulfonylimide group (Ethyl cellulose-LiFSI/NaFSI) is proposed as quasi single ion (Li+/Na+) conducting polymer electrolyte for all-solid-state lithium and sodium batteries. The degree of ethyl cellulose functionalization by anion of lithium and...
Article
The search for sodium ion battery cathodes has led to considerable interest in sodium layered oxides due to their attractive properties - e.g. flexibility, versatility, and intrinsically fast Na ion structural diffusion (leading to enhanced rate capability). Based upon our rational approach to material selection (i.e. doping a Mn-rich structure wit...
Article
Herein, we report for the first time the use of TiSb2 alloy as anode material for sodium-ion batteries (NIBs) and capacitors (NICs). The electrochemical performance of TiSb2 in NIBs shows stable cycling with a capacity of about 225 mAh·g-1 for 200 cycles. Discrepancies with the expected theoretical specific charge are discussed by means of operando...
Article
Sodium layered oxide materials have shown excellent performance as cathodes in sodium ion batteries, due to their flexibility, versatility, and intrinsically fast Na ion structural diffusion which leads to enhanced rate capability. In this work, we have examined two strategies to mitigate Jahn-Teller distortion and boost the performance of these sy...
Presentation
Due to the limited Li resources, research on Na-ion batteries and capacitors is growing exponentially leading to the fast development of Na-based energy storage devices. When high energy density and power density are needed at the same time, hybridization between battery and supercapacitor electrodes can offer the figures of merit required. These d...
Article
Sodium layered oxide materials show excellent performance as cathodes in sodium ion batteries, leading to considerable interest in routes to improving their properties. A manganese-rich P2/O3-phase Na2/3Li0.18Mn0.8Fe0.2O2 material is synthesized, from earth abundant precursors, via a solid state-reaction. Its biphasic nature is confirmed by X-ray d...
Article
Flower and easy-axis vortex states are well-known magnetic configurations that can be stabilized in small particles. However, <111> vortex (V<111>), i.e. a vortex state with its core axis along the hard-axis direction, has been recently evidenced as a stable configuration in Fe nanocubes of intermediate sizes in the flower/vortex transition. In thi...
Article
Full-text available
The different spin configurations in the vicinity of the single-domain/vortex transition are reported in isolated magnetic nanoparticles. By combining chemical synthesis, electron holography in a dedicated transmission electron microscope and micromagnetic simulations, we establish the "magnetic configuration vs size" phase diagram of Fe single-cry...
Article
Full-text available
Strain engineering is a powerful tool to tailor the physical properties of materials coherently stacked in an epitaxial heterostructure. Such an approach, applied to the mature field of planar heteroepitaxy, has yielded a variety of new phenomena and devices. Recently, heteroepitaxial vertically aligned nanocomposites have emerged as alternatives t...
Article
The magnetic anisotropy of 3-nm wide cobalt nanowires embedded in epitaxial CeO2/SrTiO3(001) layers is investigated by ferromagnetic resonance measurements. The measured magnetic shape and the magnetocrystalline anisotropies confirm that the Co nanowires have their main axes perpendicular to the film surface, and they are composed of hcp Co grains...
Article
Full-text available
In this work, experimental results on the characterization of the structural, compositional, and magnetic properties of polycrystalline Tb Al MnO (x=0,0.05,0.07,0.1,0.2 , and 0.3 ) samples synthesized by means of standard solid-state reaction are reported. The most important effect of introducing Al in the crystal lattice of TbMnO is that it induce...
Article
Self-assembled vertical epitaxial nanostructures form a new class of heterostructured materials that has emerged in recent years. Interestingly, such kind of architectures can be grown using combinatorial processes, implying sequential deposition of distinct materials. Although opening many perspectives, this combinatorial nature has not been fully...
Article
Full-text available
The magnetic relaxation of Co nanowires assemblies embedded in CeO(2)/SrTiO(3)(001) epilayers has been investigated by magnetization decay measurements. Two different samples were studied, with nanowires having distinct crystallographic structures and diameters of 3 and 5 nm. The structure of the nanowires was derived from high-resolution transmiss...
Article
Full-text available
Multiferroic materials exhibit, in the same phase, several ferric properties such as ferroelectricity, ferromagnetism, and ferroelasticity, which are coupled each to other. In this work, we synthesized polycrystalline Tb1−x Alx MnO3 (x=0, 0.05, 0.07, 0.1, and 0.3) by standard solid-state reaction. The starting precursors Tb4O7, MnO2, Al2O3 were sto...
Article
The mechanism of magnetization reversal has been studied in a model system of self-assembled cobalt nanowires with a 3 nm diameter. The structure, orientation and size of grains within the nanowires could be determined by high resolution transmission electron microscopy. The magnetic properties were probed using static and dynamic magnetization mea...
Article
Sequential pulsed laser deposition of CoO and CeO2 at 650 °C under vacuum leads to the formation of a slanted Co nanowires assembly embedded in CeO2/SrTiO3(0 0 1) epilayers. High temperature magneto-optical Faraday measurements were performed, which revealed a Faraday ellipticity of 1.3° at a wavelength of 450 nm for 300 nm thick samples and which...
Article
Full-text available
The mechanism of magnetization reversal has been studied in a model system of self-assembled cobalt nanowires with 3 nm diameter. The structure, orientation and size of grains within the nanowires could be determined by high resolution transmission electron microscopy. The magnetic properties were probed using static and dynamic magnetization measu...

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